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Hello, I searched all thru the service manual of the Technics SA-AX530 Receiver, and I have to say that there is not any way to turn the volume of the subwoofer up (or down) alone. The only control of the sound that affects the subw. level is the BASS control, but it controls also the bass at the speakers too.Good luck.

Make sure you unplug your sa 2 and sa3 amplifiers after setting the codes. Wait at least 60 seconds, then plug back in. I would also unplug the in and out boselink cables as well. Once youve waited for a minute, then plug everything back in. Should work. If not, call Bose technical support. They are really great. I have 15 SA 3 amplifiers throughout my home. They are great.

What are you tring to amplify? try using a different input.also try checking all the fuses! llllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll